diff options
Diffstat (limited to 'tvix/castore/src/directoryservice/traverse.rs')
| -rw-r--r-- | tvix/castore/src/directoryservice/traverse.rs | 153 |
1 files changed, 52 insertions, 101 deletions
diff --git a/tvix/castore/src/directoryservice/traverse.rs b/tvix/castore/src/directoryservice/traverse.rs index 573581edbd..17a51ae2bb 100644 --- a/tvix/castore/src/directoryservice/traverse.rs +++ b/tvix/castore/src/directoryservice/traverse.rs @@ -1,95 +1,72 @@ use super::DirectoryService; -use crate::{proto::NamedNode, B3Digest, Error}; -use std::os::unix::ffi::OsStrExt; +use crate::{ + proto::{node::Node, NamedNode}, + B3Digest, Error, Path, +}; use tracing::{instrument, warn}; /// This descends from a (root) node to the given (sub)path, returning the Node /// at that path, or none, if there's nothing at that path. -#[instrument(skip(directory_service))] +#[instrument(skip(directory_service, path), fields(%path))] pub async fn descend_to<DS>( directory_service: DS, - root_node: crate::proto::node::Node, - path: &std::path::Path, -) -> Result<Option<crate::proto::node::Node>, Error> + root_node: Node, + path: impl AsRef<Path> + std::fmt::Display, +) -> Result<Option<Node>, Error> where DS: AsRef<dyn DirectoryService>, { - // strip a possible `/` prefix from the path. - let path = { - if path.starts_with("/") { - path.strip_prefix("/").unwrap() - } else { - path - } - }; - - let mut cur_node = root_node; - let mut it = path.components(); - - loop { - match it.next() { - None => { - // the (remaining) path is empty, return the node we're current at. - return Ok(Some(cur_node)); + let mut parent_node = root_node; + for component in path.as_ref().components() { + match parent_node { + Node::File(_) | Node::Symlink(_) => { + // There's still some path left, but the parent node is no directory. + // This means the path doesn't exist, as we can't reach it. + return Ok(None); } - Some(first_component) => { - match cur_node { - crate::proto::node::Node::File(_) | crate::proto::node::Node::Symlink(_) => { - // There's still some path left, but the current node is no directory. - // This means the path doesn't exist, as we can't reach it. - return Ok(None); - } - crate::proto::node::Node::Directory(directory_node) => { - let digest: B3Digest = directory_node.digest.try_into().map_err(|_e| { - Error::StorageError("invalid digest length".to_string()) + Node::Directory(directory_node) => { + let digest: B3Digest = directory_node + .digest + .try_into() + .map_err(|_e| Error::StorageError("invalid digest length".to_string()))?; + + // fetch the linked node from the directory_service. + let directory = + directory_service + .as_ref() + .get(&digest) + .await? + .ok_or_else(|| { + // If we didn't get the directory node that's linked, that's a store inconsistency, bail out! + warn!("directory {} does not exist", digest); + + Error::StorageError(format!("directory {} does not exist", digest)) })?; - // fetch the linked node from the directory_service - match directory_service.as_ref().get(&digest).await? { - // If we didn't get the directory node that's linked, that's a store inconsistency, bail out! - None => { - warn!("directory {} does not exist", digest); - - return Err(Error::StorageError(format!( - "directory {} does not exist", - digest - ))); - } - Some(directory) => { - // look for first_component in the [Directory]. - // FUTUREWORK: as the nodes() iterator returns in a sorted fashion, we - // could stop as soon as e.name is larger than the search string. - let child_node = directory.nodes().find(|n| { - n.get_name() == first_component.as_os_str().as_bytes() - }); - - match child_node { - // child node not found means there's no such element inside the directory. - None => { - return Ok(None); - } - // child node found, return to top-of loop to find the next - // node in the path. - Some(child_node) => { - cur_node = child_node; - } - } - } - } - } + // look for the component in the [Directory]. + // FUTUREWORK: as the nodes() iterator returns in a sorted fashion, we + // could stop as soon as e.name is larger than the search string. + if let Some(child_node) = directory.nodes().find(|n| n.get_name() == component) { + // child node found, update prev_node to that and continue. + parent_node = child_node; + } else { + // child node not found means there's no such element inside the directory. + return Ok(None); } } } } + + // We traversed the entire path, so this must be the node. + Ok(Some(parent_node)) } #[cfg(test)] mod tests { - use std::path::PathBuf; - use crate::{ directoryservice, fixtures::{DIRECTORY_COMPLICATED, DIRECTORY_WITH_KEEP}, + PathBuf, }; use super::descend_to; @@ -132,7 +109,7 @@ mod tests { let resp = descend_to( &directory_service, node_directory_complicated.clone(), - &PathBuf::from(""), + "".parse::<PathBuf>().unwrap(), ) .await .expect("must succeed"); @@ -145,7 +122,7 @@ mod tests { let resp = descend_to( &directory_service, node_directory_complicated.clone(), - &PathBuf::from("keep"), + "keep".parse::<PathBuf>().unwrap(), ) .await .expect("must succeed"); @@ -158,7 +135,7 @@ mod tests { let resp = descend_to( &directory_service, node_directory_complicated.clone(), - &PathBuf::from("keep/.keep"), + "keep/.keep".parse::<PathBuf>().unwrap(), ) .await .expect("must succeed"); @@ -166,25 +143,12 @@ mod tests { assert_eq!(Some(node_file_keep.clone()), resp); } - // traversal to `keep/.keep` should return the node for the .keep file - { - let resp = descend_to( - &directory_service, - node_directory_complicated.clone(), - &PathBuf::from("/keep/.keep"), - ) - .await - .expect("must succeed"); - - assert_eq!(Some(node_file_keep), resp); - } - // traversal to `void` should return None (doesn't exist) { let resp = descend_to( &directory_service, node_directory_complicated.clone(), - &PathBuf::from("void"), + "void".parse::<PathBuf>().unwrap(), ) .await .expect("must succeed"); @@ -192,12 +156,12 @@ mod tests { assert_eq!(None, resp); } - // traversal to `void` should return None (doesn't exist) + // traversal to `v/oid` should return None (doesn't exist) { let resp = descend_to( &directory_service, node_directory_complicated.clone(), - &PathBuf::from("//v/oid"), + "v/oid".parse::<PathBuf>().unwrap(), ) .await .expect("must succeed"); @@ -211,25 +175,12 @@ mod tests { let resp = descend_to( &directory_service, node_directory_complicated.clone(), - &PathBuf::from("keep/.keep/foo"), + "keep/.keep/foo".parse::<PathBuf>().unwrap(), ) .await .expect("must succeed"); assert_eq!(None, resp); } - - // traversal to a subpath of '/' should return the root node. - { - let resp = descend_to( - &directory_service, - node_directory_complicated.clone(), - &PathBuf::from("/"), - ) - .await - .expect("must succeed"); - - assert_eq!(Some(node_directory_complicated), resp); - } } } |